In 1865, after major improvements to Geissler's pump, Hermann Sprengel invented the mercury vacuum pump. This tool made it possible to produce vacuums with less than one hundredth of an atmosphere in cathode ray and X-ray experiments1. A specimen of this apparatus is displayed in Museum Dr. Guislain in Ghent.
- Photo by Luca Borghi ti.supmacinu|ihgrob.l#| (August 2009), courtesy of Museum Dr. Guislain.
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